code: def test_ndim_none(self, xp):
      return xp.ndim(None)
  
file_path: cupy/tests/cupy_tests/test_ndim.py
imports: import numpy
  import unittest
  import cupy
  from cupy import testing
label_desc: Use image node_id 5 for calling the TestNdim obj's underlying member method code with example usage: obj.test_ndim_none(xp) and returns: xp